Electric lamp



2 Sheets-Sheet 1..

(No Mod al.)

J. W. LANGLEY. Electric Lamp.

Patented Dec. 7,1880.

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(No Model.) '2 Sheet s8heet 2.. J. W. LANGLEY. .Electric Lamp.

No. 235,258. Patented'Dec. 7,1880.

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UNITED STATES PATENT @rrrcn.

JOHN IV. LANGLEY, OF ANN ARBOR, MICHIGAN.

ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 235,258, dated December'7, 1880.

Application filed July 16, 1880.

To all whom at may concern:

Be it known that 1, J OHN W. LANGLEY, of Ann Arbor, in the county ofWashtenaw and State of Michigan, have invented a new and usefulImprovement in Electric Lamps, of which the following is aspecification.

In the drawings, Figure 1 is a vertical section through the lamp. Fig. 2is an end elevation. Fig. 3 is an enlarged view of a portion of Fig. 2.Fig. 4 is an enlarged side View of the lower part of the tube whichguides the upper carbon and the automatic clutch or tongs.

Like letters denote like parts in each figure.

My invention consists in the arrangement, in an electric lamp, of anautomatic tongs, constructed substantially as hereinafter described, toact directly upon one of the carbons, for ad justing the same; and,further, in the combination, with said tongs and a stationarycarbon-guiding tube, of a lever connected with said tongs and operatedby an electr c-magnet,

essentially as hereinafter particularly de-.

scribed, and pointed out in the claims.

My improved lamp is constructed as follows:

V is a hollow base or box, made of any suitable material.

A is a hollow insulated rectangular metal tube or guide, fastened to thebase V, into which the lower carbon is inserted, and may be held inposition by a thumb-screw, H, near the top of the tube A.

M is an electro-magnet. R is an armature, hinged at one end to one ofthe poles of the magnet M. The free end of the armature R is composed ofany suitable insulating material, R.

(J is a hollow post, standing on the base V, but insulated from the baseV. B is a metal arm, fastened in any convenient manner to the upper endof post 0.

P is a connecting-rod, attached at its lower end by a nut to the freeend of the armature R, and at its upper end attached in the same mannerto one end of the lever D. The length of the connecting-rod P can bevaried for purposes of adjustment by turning either of the nuts N or Nat its ends.

D is a lever, pivoted at its center on the fulcrum 3 S S are set-screwspassing through the arms of the lever D, by means of which (No model.)

the range of motion of the lever D can. be regulated.

.r is a coil-spring, placed on the upper surface of arm B, and bearingagainst the inner arm of lever D in such a manner as to keep the innerarm of lever D raised when no current is passing through the lamp.

A is a metal tube, similar to A, for guiding the upper carbon, rigidlyfastened to the outer end of arm B, and in a vertical line with tube A.The outer end of lever D is forked, as shown in Fig. 2, so that itincloses the tubeA on three sides.

F F are the jaws of an automatic clutch, similar in principle to thewell-known lazytongs. Each jaw F has apin, f, running through it, andextending beyond the sides of the tube A. The jaws F F are connected bytwo pairs of pivoted links, 0 0, each pair of links being pivotallyconnected to the opposite ends of the pinsff.

E E are two wires or rods, the lower end of each of which is pivoted tothe center of one pair of links, 0, the upper end being fastened to oneof the forked ends of lever D.

t t are lugs or stops upon which thejaws F F strike and rest when theclutch is at the bottom of its stroke.

The jaws F F slide in slots cut in opposite sides of the tube A, and areeach provided with a spindle, I, running through a guide, K, on tube A,so as to retain the jaws F F in place, while allowing sufficientlateralmotion to enable the jaws to gripe and release the carbon. Thecarbons are shown in dotted lines in the tubes A A in Fig. 1.

L is a common bindingscrew placed on any convenient part of the post (J.L is a common binding-screw placed on any convenient part of the base V,and is connected by a wire with one end of the wire on magnet M, theother end of the wire on magnet M being connected with tube A.

The post 0 is in free electrical communication with all parts of thelamp supported thereby.

The wires from the electrical machine are attached to the binding-screwsL L.

The operation of my improved lamp is as follows: The lower carbon beinginserted in the tube A and clamped therein at the proper

